In situ polymerization process of polypyrrole ultrathin films

Electrochemical deposition of polypyrrole nanolayers on discontinuous ultrathin gold films.

Ultrathin layers of polypyrrole (PPy) were electrochemically grown between microelectrodes on a Si/SiO(2) substrate. Conducting nanolayers of PPy are directly grown onto ultrathin discontinuous gold (Au) film between the microelectrodes, with thicknesses in the range 10-100 nm. The system therefore forms a novel (PPy/Au) nanocomposite conductor. Atomic force microscopy (AFM) imaging and conduct...

Magnetotransport effects of ultrathin Ni80Fe20 films probed in situ

We investigated the magnetoresistance of Permalloy (Ni80Fe20) films with thicknesses ranging from a single monolayer to 12 nm, grown on Al2O3, MgO and SiO2 substrates. Growth and transport measurements were carried out at 80K in UHV. Applying in-plane magnetic vector fields up to 100mT, the magnetotransport properties were ascertained during growth. With increasing thickness the films exhibited...

In situ oxidation of ultrathin silver films on Ni(111)

silver films on Ni(111) A. Meyer J. I. Flege S. D. Senanayake B. Kaemena R. E. Rettew F. M. Alamgir J. Falta Oxidation of silver films of oneand two-monolayer thicknesses on the Ni(111) surface was investigated by low-energy electron microscopy at temperatures of 500 and 600 K. Additionally, intensity–voltage curves were measured in situ during oxidation to reveal the local film structure on a ...

Highly conductive free standing polypyrrole films prepared by freezing interfacial polymerization.

Highly conductive free standing polypyrrole (PPy) films were prepared by a novel freezing interfacial polymerization method. The films exhibit metallic luster and electrical conductivity up to 2000 S cm(-1). By characterizing with SEM, FTIR, Raman and XRD, the high conductivity is attributed to the smooth surface, higher conjugation length and more ordered molecular structure of PPy.

Superparamagnetic ultrathin films